What is the purpose of propylene glycol and is it good or bad for hair?”
Propylene glycol is used as a carrier for scents in shampoos, and it also helps retain moisture. However, the chemical can cause allergic irritations in some people, and the chemical can also cause your scalp to release excess oil, so the shampoo industry effectively feeds off of making products that cause your hair to get very oily because your scalp does not like to be attacked by foreign chemicals. Ever notice that oily feeling that can occur so quickly after washing hair? If you don’t use shampoo with propylene glycol along with several other nasty chemicals, your hair won’t get as oily, so it won’t need to be washed as often.
